预应力锚索的三维数值模拟及其锚固机理分析

预应力锚索加固作为岩土工程的一种主要技术已得到日益广泛的应用，其强而有效的加固效果已经为众多工程实践所检验。但是，与不断改进的施工技术相比，现有的针对预应力锚索的数值模拟方法却不能很好的反映这一实际加固效果，尤其是预应力的模拟。本文根据锚索中自由段和锚固段不同的作用机理，提出了一种能够模拟预应力的三维数值方法，即锚固段采用空间杆单元来模拟，而自由段则采用一种特殊的能够施加预应力的三维杆单元来模拟。在此基础上，研究了在预应力的作用下锚索和岩体的受力变形特征及其影响因素之间的关系，并对预应力锚索的锚固效果及其作用机理作了深入分析．

Research on 3D Numerical Simulation of Prestressed Anchor Cable and Its Anchoring Mechanism

Prestressed anchor cable have been widely used as a main reinforcement method in geotechnical engineering, its effective reinforcement capabilities have been validated by many project cases. Compared with advancing construction technology, by existing numerical method the prestressed anchor cable's effect cannot be simulated successfully,especially for pre-stress simulation. According to different working mechanism between free segment and consolidated segment, a new 3D FEM is presented, by which the pre-stress can be simulated. To say it concretely, the consolidated segment is simulated by space rod element, while for the free segment a special kind rod element is used on which the pre-stress can be applied. This character makes it able to simulate tightwire successfully. On this basis, the load-deformation characteristics and its influential factors of anchor cable and rock mass are analyzed. Furthermore, the reinforcement effect and its mechanism can be explored.